Respuesta :

MissPhiladelphia
We use equations for geometric sequence. We do as follows:

a(n) = a(1) r^(n-1)
20 = ar^(2-1)
20 = ar
a = 20/r

11.25= ar^(4-1)
11.25 = ar^3
11.25 = (20/r)r^3
r = 0.75

Hope this answers the question. Have a nice day.

Answer:

0.75

Step-by-step explanation:

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